At this step, make sure that the camera is correctly positioned in front of the opening of the window. Indeed, you may notice that the camera, although attached to the chassis, has a flexible mount and can move slightly from left to right and from top to bottom. This mounting allows, I guess, to properly wedge the camera when we plate the screen on the chassis.
In my case, although the screen was perfectly aligned at the bottom left and right corners, the camera had to be positioned incorrectly because the screen did not fit snugly on the chassis. It is almost invisible to the naked eye, but it does not plate perfectly.
Be sure to check this point before removing the protections from the adhesives by playing on the mounting bracket of the camera mount.